Improvement in latches



- W. BOHANNAN.

' `La,t0h.

No. 208,708. Patented oct. 8,1878.

j@ f. I @g2 Minas/649 lsf.' l [72 2me/M071' a-WQW/ UNITED STATES PATENT OEEICE.

WILSON BOHANNAN, OF BROOKLYN, E. 1)., NEIV YORK.

IM PROV'EM ENT IN LATCHES.

Specification forming part oi' Letters Patent No. 208,708, dated October 9, 1R79; application led August 12, 1878.

To all 'whom it may concern.-

Be it known that I, WILSON BOHANNAN, of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Locks, which improvement is fully set forth in the following speciiication and accompanying drawings, in which latter- Figure l is a plan view of my lock in its normal condition with the cap removed. Fig. 2 is a plan view ofthe same, showing the bolt withdrawn into the lock and checked. Fig. 3 is a transverse section of the same in the line .c of Fig. l. Fig. 4 is a transverse section in the line y y of Fig. 1. Fig. 5 is a detail view of the bolt and vibrating check-plate as they appear when the lock is locked and the bolt checked. Fig. 6 is a detail view ot the vibrating check-plate.

The nature of my invention consists, rst, in a novel mode of attaching a vibrating checkplate to the knob which operates it and the bolt, whereby the necessity of screwing or riveting the parts together is avoided; second, in a novel means whereby the check-plate, secured in the manner I have shown to the knob, is prevented from moving longitudinally, and allowing the knob to fall out ot' the lock when the said plate is on a straight line with the bolt or latch; third, in a novel means whereby the check-plate is controlled and prevented from getting out of gear with the device which prevents longitudinal movement ot' the checkplate.

In the accompanying drawings, Arepresents the shell of a lock, B the bolt, and b its tension-spring. O represents the operating-lever ot' the bolt, which abuts against a lug, b', at the rear end of the bolt. I) isa hollow keyspindlc containing a number of slides, which are depressed by a iiat key with a stepped end. 'Ihe lever C forms a part ot' the spindle, and

said spindle is also provided with a safetyguard, E, swinging on arms c c and pivots d d', suitably secured to brackets of the spindle. One ot.' these arms, c', has a slotted extension, j', the slotf ot' which slides on a rigid pin, F, ot' the shell A when the spindle is turned by the key, and moves the satety-guard E into a number ot' transverse notches in the depressed slides.

The mechanism so far described has alread y been patented to me under Letters Patent dated August 6, 1867; and I have improved the same by providing the bolt D with a knob,

G, with a swinging check-plate or yoke, Il, having an oblong slot, h, intersecting a hole, hl. The cylindrical shank g of the knob is litted into the bolt B, which is provided with a boss, p.

The end ot the shank g extends above the bolt, and is provided, between its terminus and the boss p', with two parallel slots, g', forming a neck, g2, on the shank, upon which neck the check-plate H is fitted by bringing the round hole of the plate directly over the shank g and forcing it longitudinally with said shank until the plate is in line with the slots g1, and then sliding the plate until its oblong slotted portion stands under the terminus ot' the shank, as shown.

The plate H may be disengaged from the shank g by slipping it forward until the shank g is in the hole hl' and then lifting it off.

The plate H is provided with a pin, t', against which a V-shaped offset, `i', of aspring, I, bears. This spring I is wound around a pin, N, ofthe bolt, (to which pin, also, the tension-spring l) is fastened,) and its tail end bears against the boss p'.

The shell of the lock is provided with a post or stud, J, which has a beveled stop, j, upon a shoulder level with the boss p. By means of this stop and a hook, h2, at the forward end of the plate the bolt B can be checked, as seen in Figs. 2 and 5, by turning the knob to the right.

W'heu the bolt B is in its normal position, as shown in Fig. 1, and the knob is turned to the right, the hook hz engages with the front of the stop j, as seen in Fig. 5. It the plate H is turned when the bolt s drawn back into the lock, the back of the hook h2 engages with the inner side of the stopj, as seen in Fig. 2. In the former ease the bolt is locked and checked, and cannot be unlocked with the key ot' the lock. In the latter case the bolt is unlocked and checked.

When the plate H is engaged with the stop j, the pin is on the outer side of the vertex of the V-offsct and when the plate is disengaged the pin is on the inner side of the de scribed vertex, and it is in both cases kept in place by the V-shaped offset of the spring I.

A lug, k, on the cap K of the lork serves to keep the plate II in such position that it is always in contact with a stud, M, of the bolt B by means ot' acurved bearing, l1, of the plate, and thus itis prevented from accidentally slipping forward on the shank r/ until the round hole hl coincides with the shank, and thus allowing' the knob to fall out ot' the lock.

I am aware that oscillating' knobs have been made and used for moving back the bolt of a lock and checkingv the same in its two main positions; and therefore the gist ot' my invention lies in the means employed for accomplishing this end.

By constructing,l and using` the plate Il and the lateral slots ql iu the manner I show, the knob and plat-e are so united with the bolt that the lock is very durable, and at the saine time the connection and disconnection of the parts may be readily e'eeted without the aid of tools, as there are neither screws nor rivets used for the purpose of uniting' those parts.

Having; thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In a night-latch and lock, the bolt-operating knob having a shank, g, with an oblong neck or groove, g2, in combination with a check-plate, H, having,l a slot, h, and hole h1, whereby the checkplate is connected to the shank of the knob without riveting, pinning, or screwing, and the knob held in place, substantially as described.

2. The combination of the check-plate II, having` a bearing, h3, the stud M, and stud lf, substantially as and for the purpose described.

3. The check-plate H, provided with the slot h and hole h, shoulder h3, and hook h2, for application directly to the shank of the knob G and use with the studs J and M, substantially as and for the purpose described.

\\'ILSON BOHANNA N.

\\'itnesses:

GEORGE (ooDALE, \\'iLsoN '1. BoHANNAN.

eN." L 

